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Method for producing ultra-coarse grain cemented carbide through utilizing high energy stirring and ball-milling technology

A high-energy stirring ball milling and cemented carbide technology, which is applied in the field of metal materials, can solve problems such as low uniformity of alloy grains, low kinetic energy of grinding balls, and low speed, so as to improve grinding effect, shorten ball milling time, and reduce energy consumption Effect

Inactive Publication Date: 2014-01-29
ZIGONG JINDUN CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent still has defects: in the mild ball milling of the premixed material in the ball mill, due to the low speed of the ball mill and the low kinetic energy of the grinding balls, there is obvious surface wear on the WC particles, resulting in more fine particles. pink
The grain uniformity of the final produced alloy is not high

Method used

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  • Method for producing ultra-coarse grain cemented carbide through utilizing high energy stirring and ball-milling technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw materials are prepared according to 94wt%WC+6wt%Co (the average Fibonacci particle size of tungsten carbide is 15μm, and the average Fischer particle size of cobalt powder is 1.3μm.) Add 250ml / Kg of alcohol with a volume concentration greater than 90% as the grinding medium, and 0.5g / Kg of oleic acid was added to the mixture slurry as a suspending agent, and 2wt% paraffin was used as a binder. The above-mentioned materials are ball milled in a stirring ball mill. The rotating speed of the stirring arm of the ball mill is set to 100 rpm, the filling factor is 0.4, and the ball-to-material ratio is 2:1; after 120 minutes of ball milling, the slurry is discharged for vacuum drying. After molding the mixture, it is vacuum sintered at 1450℃. The average grain size is 10μm, the porosity is A02B00, and the metallographic structure is shown as figure 1 As shown in the figure, it can be clearly seen that the alloy crystal grains of the obtained cemented carbide products a...

Embodiment 2

[0029] According to 87wt%WC+13wt%Co, the raw materials are prepared (the Fisher average particle size of tungsten carbide is 15μm, and the average fisher size of cobalt powder is 1.3μm.) Add 260ml / Kg of alcohol as the grinding medium and add it to the mixed slurry 0.5g / Kg of oleic acid was used as a suspending agent, and 2wt% paraffin was used as a binder. The above materials are ball milled in a stirring ball mill. The rotation speed of the stirring arm of the ball mill is set to 100 rpm, the filling factor is 0.4, the diameter of the grinding ball is 10.0mm±0.2mm, and the ball-to-material ratio is 4:1; after 150 minutes of ball milling, Unload the slurry for vacuum drying. The mixture was molded and sintered in a vacuum at 1430°C. The average grain size was detected to be 5μm and the porosity was A02B00.

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Abstract

The invention relates to a method for producing ultra-coarse grain cemented carbide through utilizing a high energy stirring and ball-milling technology. Preparation raw materials comprise WC, Co and a small amount of NbC or / and TaC which is served as an additive, wherein the particle granularity of the WC is not less than 15 micrometers, and the WC accounts for 82.0-95.5wt%, the Co accounts for 4.5-18wt%, and the additive accounts for 0.0-0.5wt%. The preparation method comprises the following steps: (1) a high energy stirring and ball milling process, namely, filling all the preparation raw materials, i.e. the WC, cobalt powder and the additive into a high energy stirring ball mill, and adding a plasticizer and a ball-milling addition agent for ball milling; (2) a vacuum drying and granulating process; and (3) conventionally pressing a mixture for forming, and carrying out vacuum sintering or pressure sintering within a scope of 1400 DEG C-1480 DEG C. By utilizing the technology, the milling effect of the powder can be greatly improved, the ball milling time is obviously shortened, the production efficiency is improved, the energy consumption is reduced, and alloy crystal grains are uniformly distributed.

Description

Technical field: [0001] The invention belongs to the technical field of metal materials, and relates to a new type of process, a method for preparing ultra-coarse grained cemented carbide by adopting a high-energy stirring ball milling process. Background technique: [0002] Ultra-coarse grained cemented carbide refers to a cemented carbide with an average grain size greater than 4 microns. Because of its high thermal conductivity and high toughness, it is widely used in coal mining, engineering construction, metal chipless processing, and steel rolling And other industries, has a service life far better than conventional cemented carbide. [0003] U.S. Patent Nos. 5,505,902 and 5,529,804 disclose methods for preparing ultra-coarse-grained cemented carbides. The coarse-grained WC is dispersed and sieved by jet milling, and fine WC particles are removed. Only the coarse-grained WC is selected. Carry out cobalt coating. The cobalt coating method used in the patent 5505902 is a melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 李洪全刘礼平
Owner ZIGONG JINDUN CEMENTED CARBIDE
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